title: Au-Ag template stripped pattern for scanning probe investigations of DNA arrays produced by dip pen nanolithography.
abstract: We report on DNA arrays produced by dip pen nanolithography (DPN) on a novel Au-Ag micropatterned template stripped surface. DNA arrays have been investigated by atomic force microscopy (AFM) and scanning tunneling microscopy (STM) showing that the patterned template stripped substrate enables easy retrieval of the DPN-functionalized zone with a standard optical microscope permitting multi-instrument and multitechnique local detection and analysis. Moreover the smooth surface of the Au squares ( approximately 5-10 A roughness) allows AFM/STM to be sensitive to the hybridization of the oligonucleotide array with label-free target DNA. Our Au-Ag substrates, combining the retrieving capabilities of the patterned surface with the smoothness of the template stripped technique, are candidates for the investigation of DPN nanostructures and for the development of label-free detection methods for DNA nanoarrays based on the use of scanning probes.
authors.affiliation: Dipartimento di Chimica, Materiali e Ingegneria Chimica "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Baserga
authors.forename: Marco
authors.initials: M
authors.lastname: Viganò
authors.forename: Carlo S
authors.initials: CS
authors.lastname: Casari
authors.forename: Stefano
authors.initials: S
authors.lastname: Turri
authors.forename: Andrea
authors.initials: A
authors.lastname: Li Bassi
authors.forename: Marinella
authors.initials: M
authors.lastname: Levi
authors.forename: Carlo E
authors.initials: CE
authors.lastname: Bottani
mesh_terms: D004247:DNA / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods; D006046:Gold / Q000737:chemistry*; D008853:Microscopy / Q000379:methods; D018625:Microscopy, Atomic Force; D008858:Microscopy, Phase-Contrast; D020527:Microscopy, Scanning Probe / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D009693:Nucleic Acid Hybridization; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation* / Q000379:methods; D055095:Optics and Photonics; D012825:Silicon / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013379:Substrate Specificity
chemical_list: D012834:Silver; D006046:Gold; D004247:DNA; D012825:Silicon